Year	Percent
1990	1.00465
1991	0.92207
1992	0.88986
1993	0.85827
1994	0.83102
1995	1.14524
1996	1.10723
1997	1.06861
1998	0.60788
1999	0.58947
2000	0.58327
2001	0.56886
2002	0.555
2003	0.68186
2004	0.73972
2005	0.72237
2006	0.72046
2007	0.70826
2008	0.67883
2009	0.64436
2010	0.61345
2011	0.61661
2012	0.61187
2013	0.55348
2014	0.49073
2015	0.47709
2016	0.56981
2017	0.55266
2018	0.51785
2019	0.52284
2020	0.54676